CVE-2026-12027: Inappropriate implementation in Headless in Google Chrome prior to 149.0.7827.115 allowed a remote attacker wh

Q: How do I fix CVE-2026-12027?

chrome: upgrade to 149.0.7827.115. Exact commands for each OS are on this page.

Q: Is CVE-2026-12027 being exploited?

CVE-2026-12027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-12027 affect?

CVE-2026-12027 affects chrome. Severity is critical (CVSS 9.6). Inappropriate implementation in Headless in Google Chrome prior to 149.0.7827.115 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severit

Q: How urgent is CVE-2026-12027?

Priority 37/100. Critical severity

This month

CRITICAL 9.6UPGRADE

CVE-2026-12027 is a critical-severity flaw (CVSS 9.6) affecting chrome. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Inappropriate implementation in Headless in Google Chrome prior to 149.0.7827.115 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

Why this priority

Critical severity

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-250, CWE-693
Published	2026-06-11
Last modified	2026-10-26

Publisher (CNA): Chrome · Vendor: google

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-11 22:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

google chrome UPGRADE

Affected: < 149.0.7827.115

Fixed in: 149.0.7827.115

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chrome || rpm -q chrome || chrome --version

2. UPGRADE to 149.0.7827.115 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chrome

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chrome

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-12027?

chrome: upgrade to 149.0.7827.115. Exact commands for each OS are on this page.

Is CVE-2026-12027 being exploited?

CVE-2026-12027 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-12027 affect?

CVE-2026-12027 affects chrome. Severity is critical (CVSS 9.6). Inappropriate implementation in Headless in Google Chrome prior to 149.0.7827.115 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severit

How urgent is CVE-2026-12027?

Priority 37/100. Critical severity

Software pages

Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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